References

Short Burst Data

SBD is a bandwidth-limited messaging system, capable of transmitting packets of up to 340 bytes, and receiving packets of 270 bytes. With a good view of the sky, it is possible to send/receive approximately once every 40 seconds.

A single 50 byte message consumes 50 characters, which is 1 RockBLOCK credit, and costs around $0.16. The message service should therefore only be used for high-priority telemetry when all other links are down.